CPT code 84252: Riboflavin, vitamin B-22026 Medicare lab fee · Clinical Laboratory Fee Schedule
CPT 84252 reports laboratory measurement of riboflavin (vitamin B-2), distinguishing it from assays for other nutrients when this specific analyte is tested.
Medicare pays $20.24 for 84252 under the 2026 Clinical Laboratory Fee Schedule: one national amount, the same in every state and setting.
Medicare lab fee · CLFS 2026 Q4
National CLFS amount
$20.24
In effect since Jan 1, 2026. The same amount in every state, payment locality and setting.
- Geographic adjustment
- None
- Office vs facility
- Same
- Since 2020
- Unchanged
- CMS updates
- Quarterly
Medicare pays the lesser of the lab’s charge and this amount. Patients usually owe no Part B deductible or coinsurance for covered clinical lab tests.
On this page 7 sections
What 84252 covers
The assay measures riboflavin, also called vitamin B-2. CPT 84252 identifies this analyte specifically, rather than vitamin B-6 (84207) or selenium (84255). Select it when the laboratory assay performed measures riboflavin; a test for another nutrient belongs to that analyte's code. This code identifies the riboflavin assay, not a broader B-vitamin panel. Clinical laboratories report the result as a riboflavin measurement.
Medicare pays 84252 only under the Clinical Laboratory Fee Schedule (CLFS), at one national amount applicable in every state and locality. The amount has no geographic adjustment and does not differ between office and facility settings. The 2026 national CLFS amount is $20.24, unchanged from 2020 through 2026. Payment is excluded from the physician fee schedule by statute, so the test is paid only through the CLFS.
This summary was written with AI assistance from CMS Clinical Laboratory Fee Schedule data. Amounts on this page come directly from CMS files.
How Medicare pays 84252
Clinical lab tests aren’t priced like physician services. They’re paid from their own fee schedule, with its own rules. See the whole lab fee schedule.
One national amount
CMS sets a single Clinical Laboratory Fee Schedule amount for 84252. There’s no geographic (GPCI) adjustment, so it pays the same in every state and payment locality.
No office or facility rate
Lab tests aren’t built from relative value units, so there’s no office and facility split: the place of service doesn’t change the CLFS amount.
Updated every quarter
CMS republishes the CLFS each quarter. New tests, often proprietary laboratory analyses (PLA codes), join during the year; existing amounts are updated each January.
Excluded from the physician fee schedule
The physician fee schedule lists 84252 with status X (excluded by statute), so the test itself is paid only from the CLFS.
84252 on the lab fee schedule since 2020
84252 · CLFS 2026 Q4 (current)
$20.24
Unchanged since Jan 1, 2020
27 quarterly CLFS releases on file, first CLFS 2020 Q1. A code missing from a quarter wasn’t on that release.
84252 compared with similar tests
84252 billing questions
When should 84252 be used instead of the vitamin B-6 assay?
Use 84252 when the assay measures riboflavin (vitamin B-2). Code 84207 identifies vitamin B-6.
Does 84252 report a panel of B vitamins?
No. It identifies a riboflavin assay, not a broader B-vitamin panel.
How does Medicare pay for 84252?
Medicare pays it under the CLFS at one national amount, without geographic or office-versus-facility payment differences.
Does 84252 have physician fee schedule payment?
No. It is excluded from the physician fee schedule by statute and paid only through the CLFS.
Where this amount comes from
FeeBase reads lab amounts directly from the CMS Clinical Laboratory Fee Schedule file for the quarter: one row per code, with its payment indicator and national amount. Contractor-priced tests are labeled, never given a made-up amount. Amounts are Medicare payment limits, not a patient’s bill or a commercial rate.
CMS CLFS 2026 Q4 · effective Oct 1, 2026 through the day before Jan 1, 2027
Show the CMS file line behind this amount
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